Carrier 30GTN Service And Troubleshooting Manual page 49

ALARM/ ALARM
ALERT OR DESCRIPTION
CODE ALERT
112 Alert Circuit A High Suction
Superheat
113 Alert Circuit B High Suction
Superheat
114 Alert Circuit A Low Suction
Superheat
115 Alert Circuit B Low Suction
Superheat
116 Alert Circuit A Low Cooler
Suction Temperature
117 Alert Circuit B Low Cooler
Suction Temperature
118 Alert Circuit A Low Oil
Pressure
119 Alert Circuit B Low Oil
Pressure
LEGEND
CCN — Carrier Comfort Network
CPCS — Compressor Protection Control System
CXB — Compressor Expansion Board
EMM — Energy Management Module
EXV — Electronic Expansion Valve
FSM — Flotronic™ System Manager
MBB — Main Base Board
MOP — Maximum Operating Pressure
WSM — Water System Manager
Table 27 — Alarm and Alert Codes (cont)
WHY WAS THIS
ALARM
GENERAED?
If EXV is greater than
98%, suction superheat is
greater than 75 F (41.7 C)
and saturated suction tem-
perature is less than MOP
for 5 minutes
If EXV is greater than
98%, suction superheat is
greater than 75 F (41.7 C)
and saturated suction tem-
perature is less than MOP
for 5 minutes
If EXV is greater than
10%, and either suction
superheat is less than
19 F (10.6 C) or saturated
suction temperature is
greater than MOP for
5 minutes
If EXV is greater than
10%, and either suction
superheat is less than
19 F (10.6 C) or saturated
suction temperature is
greater than MOP for
5 minutes
1. If the saturated suction
temperature is 24 to
29° F (13.3 to 16.1° C)
below cooler LWT and
is also 2° F (1.1° C)
less than freeze*
2. If the saturated suction
temperature is 30° F
(16.7° C) below cooler
LWT and is also 2° F
(1.1° C) less than
freeze* for 10 minutes
1. If the saturated suction
temperature is 24 to
29° F (13.3 to 16.1° C)
below cooler LWT and
is also 2° F (1.1° C)
less than freeze*
2. If the saturated suction
temperature is 30° F
(16.7° C) below cooler
LWT and is also 2° F
(1.1° C) less than
freeze* for 10 minutes
Oil pressure switch open
after 1 minute of continu-
ous operation
Oil pressure switch open
after 1 minute of continu-
ous operation
49
ACTION TAKEN RESET
BY CONTROL METHOD
Circuit A shutdown Manual
after pumpdown
complete.
Circuit B shutdown Manual
after pumpdown
complete.
Circuit A shutdown Automatic restart
after pumpdown after first daily
complete. occurrence. Manual
restart thereafter.
Circuit B shutdown Automatic restart
after pumpdown after first daily
complete. occurrence. Manual
restart thereafter.
1. Mode 7 initiated. 1. Automatic reset
No additional if corrected.
capacity in-
creases. Alert
not tripped.
2. Circuit shutdown 2. Manual
without going
through pump-
down.
1. Mode 8 initiated. 1. Automatic reset
No additional if corrected.
capacity in-
creases. Alert
not tripped.
2. Circuit shutdown 2. Manual
without going
through pump-
down.
Circuit shutdown Manual
without going
through pumpdown.
Circuit shutdown Manual
without going
through pumpdown.
*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze
is CSP.1 −8° F (4.4 C) for single set point and lower of CSP.1/CSP.2
−8° F (4.4 C) for dual set point configuration.
NOTE: The following table shows illegal configurations:
1 Zero compressors in a circuit
2 Four compressors in a circuit with two unloaders
3 Four compressors in a circuit with one unloader and hot gas
bypass
4 Two unloaders and hot gas bypass in a circuit.
5 More than one compressor quantity difference between circuits
6 Fluid type of low temperature brine
7 Air cooled head pressure control with common fan staging and
different head pressure control methods for each circuit.
PROBABLE
CAUSE
Faulty expansion valve
or EXV board, low re-
frigerant charge,
plugged filter drier,
faulty suction gas ther-
mistor (T7) or cooler
thermistor (T5).
Faulty expansion valve
or EXV board, low re-
frigerant charge,
plugged filter drier,
faulty suction gas ther-
mistor (T8) or cooler
thermistor (T6).
Faulty expansion valve
or EXV board, faulty
suction gas thermistor
(T7) or cooler ther-
mistor (T5).
Faulty expansion valve
or EXV board, faulty
suction gas thermistor
(T8) or cooler ther-
mistor (T6).
Faulty expansion valve
or EXV board, low re-
frigerant charge,
plugged filter drier,
faulty suction gas ther-
mistor (T7) or cooler
thermistor (T5), low
cooler fluid flow.
Faulty expansion valve
or EXV board, low re-
frigerant charge,
plugged filter drier,
faulty suction gas ther-
mistor (T8) or cooler
thermistor (T6), low
cooler fluid flow.
Oil pump failure, low
oil level, switch failure
or compressor circuit
breaker tripped.
Oil pump failure, low
oil level, switch failure
or compressor circuit
breaker tripped.